n.二数；一对；二元一位

As a result, dyad spores formed. 结果形成二分体孢子。

Status Offline What the Hell's a Naiad Dyad? 到底什么是“水中仙女二元体”？

The dyad formed in Meiosis I was wrapped by thick callose. 粗/双线期，细胞的电子密度增加，细胞壁积累胼胝质，切断大孢子母细胞与珠心细胞之间的胞间连丝，核糖体的数量增多，线粒体与质体的形态变得不易区分，呈现脱分化状态。

At tetrad stage, dyad, triad, tetrad with micronucleus and polyad appeared. 四分体时期还出现二分体、三分体、含微核的异常四分体及多分体。

Take the quiz if you suspect that one of your friendships is actually a naiad dyad. 做个小测验看看自己的某段友谊是否是这种二元体。